Pipe-threading machinery.



4 E. D. WESTRIPE R. MOCARTY. PIPE THREADING MACHINERY.

PATENTED DEC. 10, 1907.

APPLICATION FILED JAN. 28, 1905.

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' 'PATENTED DEC.10, 1907. E. D. WESTRIP &:.R. MOGARTY. PIPE THREADING MACHINERY.

APPLICATION FILED IAK.28,.1905.

2 SHEETS-SHEET 2.

M ATTORNEXf UNITED STATES PATENT OFFICE.

EDWARD D. WESTRIP, OF MYERSTOWN, AND RALPH MCCARTY, OF LEBANON, PENN SYLVANI-A.

PIPE-THBEADING MACHINERY.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application filed January 28. l9 05. Serial No. 243.009.

\ To all whom 'it may concern:

Beit known that W6,EDWARD D. WESTRIP, of Myerstown, Pennsylvania, and RALPH MCCARTY, of Lebanon, Pennsylvania, both citizens ofthe United States, have invented certain new and useful Improvements in Pipe-Threading Machinery, of which the following is a specification.

Our invention relates to pipe-threading machinery and more especially to means for automatically controlling the dies so as to cut threads of any desired length, and further relates to various devices incidental to the die-head being cut away and removed to show clearly mechanism contained within it; Fig. 4 is a section along the line ao on Fig. 1. Moreover in viewing this figure, it should be compared with Fig. 3 -because it shows the same parts 24, 25, and 26 as Fig. 3 in the same osition of adjustment and viewed from t e same point of view, that is from above. This figure differs however from Fig. 3 in that it is a non-perspective and partly sectional view of the'parts in question, and in the further particular that it shows the character and relative location of the recess 30 in the wall of the die-head 1. This recess was purposely omitted from Fig. 3 in order not to encumber the drawing. supplied however it would occupy the same relative osition to the parts 24, 25, 26 etc. as that s own in Fig. 4. Fig. 5 is a view in elevation looking in the direction of the arrow at the parts shown in Fig. 4; Fig. 6 is a section through the axis of the shaft 24, and

I along the line bb in Fig. 3 Fig. 7 is a horizontal section along the line c-c of Fig. 6; and Fig. 8 is a horizontal section along the line d-(l of Fig. 6.

In the accompanying drawings our imrovements are shown in connection with one type of pipe-threading machine, but it is to be understood that our improvements are not limited to this peculiar type of machine, but may be used in other types, and we are not to be understood as limiting ourselves in this regard.

Describing now the drawings in which .on the other side of the the same reference characters designate corresponding parts throughout, and in which some of the forms only, which our improvements may take, are illustrated; the numeral 1 designates a stationary die-head upon which is rotatably mounted the cam-ring 2, by the rotation of which the position of the dies3 is governed. It will be unnecessary to go into the detailed construction of these parts; suffice it to say that the camring is provided on the inside with cams (not shown), which operatively engage the 'dies located in slots in the stationary diehead and serve to project said dies into their cutting osition when the ring is rotated sufficient y to the right, and to withdraw said dies when the ring is rotated to the left. The means for so operating the cam-ring comprises a bracket 5 on the die-head, to which is pivotally secured the lever 6 by the pivot 7; also the bracket 8 secured to the camring, to which the threaded rod 9 is pivoted I b means of the plain swivel-nut 10 through w 'ch the rod passes, and within which it can be rotated on itself: A collar 13 on this rod, in connection with the head 12 located lain swivel-nut, prevents the rod from sli through the nut, but does not interfere with its rotation therein. The lever 6 and the rod, 9 are pivotally connected by the threaded swivelnut 11 secured to the lever,-the threads on the end of the rod eo-acting with the threads in the swivelnut. An abutment'42 is provided on the lever 6, and is arranged to engage against the rod 9 when the three pivotal lfconnections 10, 11 and 7 are in substantial alinement. The effect of this is that the thrust of the pipe as it rotates under the dies, tending as it does to rotate the camring to the left, is unable to so rotate it when the lever is seated against the rod, because all three pivotal connections being alined the thrust of the rod on the lever acts throu h the fulcrum of the lever, and consequent y has no leverage to raiseit out of its engaged osition against the rod; the ring is thereore effectlvely locked against rotation due to the thrust of the pipe on the dies.

By turning the threaded rod 9 one way or the other the distance between the pivots 10 and 11 can be adjusted, and consequently the degree of rotation of the cam-ring and of the projection of the dies, regulated.

Describing now the features belonging particularly to our present improvements,

they may be said to comprise in a general way, first, automatic operating meansfor raising the lever 6, and consequently withdrawing the dies 3 at a given instant; second, 5 means for looking, for example, the lever 6 by engaging same with a stop which prevents the automatic operating means from acting; third, means comprising a finger adjustably supported in the path of the pi e 10 as it is fed between the dies, and operative y connected with the aforesaid stop, whereby when a given length of thread has been cut the end of the pipe presses against the adj ustable finger in its path, moves the above mentioned stop out of engagement with its interlocking part on, the lever, and allows the automatic operating means to raise the lever and thereby withdraw the dies and stop their threading action; and, fourth, means for wholly withdrawing the finger out of the ath of the pipe in order that the latter may e fed freely through the die-head and cut off at the desired length. Describing now more particularly these devices as illustrated in the drawings: The automatic lever or -'camring operating means comprises the spiral spring 18 attached at 19 to a fixed part of the machine, and at the other'end connected, by a chain assing over the pulley '30 16, with the end of t e upright 14 secured.

to the lever 6. In Fig. 1 the lever is sup: posed to be held down forcibly and the spring 18 to be under tension, whereas in Fig. 2

the lever has been released and the s ring 35. allowed to act, with the result that the ever has been raised into the position-shown, the

cam-ring rotated to the left, and the dies withdrawn from the pipe.

The means for preventing the automatic operating means from coming into action comprises a lug 22 on the lever 6, which is adapted to engage under a stop 23 secured to the rock-shaft 24. This rock-shaft extends through the die-head in which it has its bearing, and is provided at its lower end with a connection 25 in which is adjustably mount ed the finger 26; the fin er being adapted to project into the path 0 the pipe when the stop mounted on the other end of the rockshaft en ages the lug on the lever, and when pressed y the pipe to rotate the rock-shaft and to disengage the stop 23 from the lever and to allow same to be pulled up by the spring 18. The finger 26 is adjustably supported as stated by providing same at its lower end with flanges which are adapted to engage the dovetail groove 27 in the extension 25 on the rock-shaft. Screw threads are provided at the base of the finger 26 with which the nut 29 engages, and when screwed down against the top of the groove is effective to hold the finger rigidly in any position of adjustment along the groove. By having the finger 26 adjustably mounted it can be located at various positions along the direc- 'occupy a lower and lower level.

tion of the pipe feed, and will control, depending upon its position, the length of thread cut on the pipe, since the dies will keep on cutting until the end of the pipe strikes the finger. The means for allowing .the finger to be withdrawn from the path of the pipe, in orderthat the latter may be fed through the die-head and cut ofi at the desired length, comprises the recess 30 in the die-head, into which by rotation-of the rock-shaft the finger 26 and the adjustable support 25 can be recessed or withdrawn. This is accomplished automatically by the action of the spiral-- spring 35 acting on the end 36. of the pivotpin 33 of the handle 32, and which, when unopposed, rotates the finger 26 into the recess in the die-head. The means for opposing this action of the spring 35 comprises the handle 32, pivoted to the collar 34 secured to the upper end of, the rock-shaft, and a raised stop 31 secured to the die-head, and arranged to enga e the side of the pivoted handle 32 when t e rock-shafthas'been rotated to a ppsition where the finger 26 projects into t e path ogpthepipe. By raising the pivoted handle32, so that itno longer engages the fixed stop 31, the sprin 35 is allowed to act and rotates the rock-s aft to withdraw the fin er into the "recess.

lt will benote that as the'.threaded rod 9 is adjusted so as to rotate the cam-ring more and more to the right, thatthe threaded rod willbecome more and more depressed, and consequently, since the lever follows the rod, the lug 22 on said lever will correspondingly We have therefore provided means for regulatin the position of the stop 23 on the rock-s aft, which, it will be remembered, en ages with the lugon the lever, to correspon with the varying positions of the latter. This we accomplish very effectively by providing a sleeve 38 which is adapted to fitloosely over the threaded end of the rockshaft. This sleeve bears the stop 23, and is prevented from rotating on the rock-shaft by the spline 39, while the hand nuts 40 and 41 on either side of the sleeve allow the same to be quickly adjusted at any position along the threaded end of the rock-shaft.

Having thus described our invention what we claim is 1. In a pipe-threading machine, the combination of a diehead rovided with dieslots; dies located in said slots and operatively connected with a rotatable cam-ring and governed thereby; cam-ring mechanism comprising said cam-ring and means for rotating it into and out of the working position which it occupies when the dies are cutting locking means comprising a stop secured to a rock shaft and a part in said cam-ring 'mechanism which when engaged lock the "am-ring in its Working position; said rock shaft; a finger adapted to project into the path of the pipe-feed and secured to said rock shaft, and adapted when pressed by the moving pi e to move the aforesaid stop on the rock s aft out of its engaged position; and automatic means adapted to shift the cam-ring automatically out of its working position when the parts comprising the looking means are disengaged.

2. In combination, a die-head having'an opening therein in the direction of the ipefeed to permit the complete passa e t erethrough of a pipe; dies projecting cm the die-head into said opening and movable into and out of cutting position to thread the pipe; die-locking means adapted when engaged to lock the dies in cutting position; a

rock-shaft; a finger on said shaft rotatable therewith into and out of the path of the pipefeed and connected with the die-locking means, said finger operating when pressed by the pipe, to disengage said locking means; a spring acting on the rock-shaft normally to rotate the finger against the direction of the pipe-feed and out of its path; and a releasable stop adapted to stop rotation of the rock-shaft at the point where its finger is in the path of the pipe, until'said stop is released.

3. In a ipipe-threading machine, the combination o' a die-head; a cam-ring rotatably mounted on said die-head; dies operatively connected with the cam-ring and governed by the rotation thereof; an arm secured to the die-head by a pivotal connection; a second arm secured to the cam-ring by pivotal connection; a pivotal connection between said arms; an abutment on the first arm arconnected with the rotary cam; a

ranged to engage the second arm when said arms are positioned with their three pivotal connections in substantial alinement; adj usting means adapted to vary the length of the second arm between its respective pivotal connections with the first arm and the cam-ring; a movable sto ada ted to engage one of said arms and to ock t 'e cam-rin 1n the working position which it occupies w en the dies are cutting; a support for said stop;

means for adjustin the position of said stop on its support; an means operatively con nected with said stop and adapted to contact with the moving pipe to disengage the movable stop.

4. In combination, a die; a rotary cam adapted to control said die; an arm secured to a stationary part by a pivotal connection; said stationary part; a second arm pivotally ivotal connection between said arms; ockin means comprising a movable stop ada te to engage one of said arms and to lock t em in the position which they occupy when the die iscutting; and .a finger connected with said movable stop and rojecting into the path of the article being t eaded and adapted when pressed by said article to disengage the stop.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing witnesses.

EDWARD n. WESTRIP.

RALPH MGCARTY.

Witnesses:

HARRY H. SHUCKER, LEIGHTON F. KRUM. 

